Rough idle, bogs down sometimes at stops?

NISSAN89

MEMBER
2 POSTS
1989 NISSAN SENTRA

My nissan is always accelerating, even when the car is stopped or is in neutral. I cant find out what it is. My gas mileage is dirt low because my rpm is always at at least 2500-3000. I tried moving the distributor(time) and the engine reduced but after about 20 seconds it accelerated back to 2500. Do you know what this could be?

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Friday, August 28th, 2020 AT 9:51 AM (Merged)

RASMATAZ

MECHANIC
75,992 POSTS

Leakage on these areas can cause your problem: injector o-rings, intake manifold gasket, throttle body gasket, vacuum hoses and fittings-to include the the brake booster and the evap purge valve.

Also you can do an inital adjustment of the throttle position sensor. Or try cleaning out the throttle body.

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Friday, August 28th, 2020 AT 9:51 AM (Merged)

RASMATAZ

MECHANIC
75,992 POSTS

Try cleaning out the throttle body especially around the throttle plate-then check the idle air adjusting unit or the FICD fast idle control device.

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Friday, August 28th, 2020 AT 9:51 AM (Merged)

GALAND_GREENWOOD86

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1 POST
1988 NISSAN SENTRA

1988 Nissan Sentra 4 cyl Front Wheel Drive Automatic

im at a loss tring to figure out what is wrong it will go but spits and sputters and lunges forward and somtimes it cuts out and the fuel pump is working I need help plz

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Friday, August 28th, 2020 AT 9:51 AM (Merged)

RASMATAZ

MECHANIC
75,992 POSTS

Lack of acceleration, chugging, hesitating, bogging etc. Could be caused by one of the following below.

Inspect and test all the following listed below and get back with some results

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard.